If you received a letter from a jailed stranger (who might be a parent of your child's friend), would you let the friend read the letter?

I got a letter from a guy in Rikers Island jail. I absolutely do not know this guy. I’m assuming he writes a bunch of women daily…

My teenage son saw the envelope and wanted to know why his friend from school wrote to me. I had him read the letter (because I thought it was very funny) a couple of days ago.

Yesterday, my son told me that his friend has the exact same name as this guy, and is named exactly the same as his father. The kid doesn’t know his father, but knows that he’s from the NYC area and is currently in jail. The kid asked my son if he could read the letter.

What, in your opinion, are the ethical/developmental/psychological issues here?? Would you give your kid the letter for his friend to read?